Comparison between the Lightweaver synthesis of the FAL-C, stacked, and two-part models. Top row: synthetic spectra for hydrogen Hα and the calcium II 8542 Å of the IR triplet for each of the models. For reference, the two-part model was also synthesised using the method of Hea15, along with the disk centre spectrum of David (1961) which is used as its associated background intensity. Bottom row: stratified source functions corresponding to the spectra synthesised in the top row.